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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744630d4432ed5c4b612f28ad98acb6cd4c3b05284a87fa872d0844943e51d0a' 
  AND token = 'LpV2P8rGeHjSbZaC2LOjMvmnVbO6+Ubb3/5+lbq9QaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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