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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98d578fd23bb8cf52263430a96ddb296b6d07fa49915c763b63ded05f2d260d' 
  AND token = '+eGu0wDzjxB5766x1PNrFaZk06rMD7VHJDl1gsIiIis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}