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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d4c41f6f0c4126a14519fdf0a5b3d61cd7ebae2b0d1eb811dc61d469031e4e' 
  AND token = 'xvYsTcKGXy269w5IYz44lwv0xHgPLmX9w6VXqcQYH+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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