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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a368626d2b764a2427d35e1f12b1ec4e6a324428b5de30dae447e5dc27b8e16' 
  AND token = 'EbhRBW8s8We0vRimnB3welUSx5IJBzJwlkdw0vU/+VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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