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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35da55efb66530bf4123b08911560f3a7c6e37d6927dbe40cc28280b48f2233e' 
  AND token = 'X4E+iLNstwSat+KEkmR8bw6y/dqf6rNkAAfOYGQW/mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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