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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe17df82a20bbabe2954f4fd93beb116fd185386c8681ebd1e3b0cf26dbffd2' 
  AND token = 'cqzCJuA2tphLltsx88CZKV6nWrUvb2g/16FO1gyCbBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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