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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97db4e4a95166b737de6fe0955cb80899f1913d6577feb7e25ecc6adce93f83' 
  AND token = 'W9yRdSud99oVhlwnXE4n8qj/Z0WEqTTgzJrILwod8hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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