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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e491a95152ad195b8a289853df5cfccfa45a732d4e824ab8944269ac9eee77' 
  AND token = '7CQ0nrZOBo6odf8qEYPEq/Q7RK6pG5h1iqjWjPUff1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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