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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff188c094d679b88ea7a4d4a134b6b31098cee41fde1af65746d903a93928722' 
  AND token = 'oNRI39CeJdlmEfFJNW1Z/fsfmSDOqzjcJvXnzIKEKF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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