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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d95b24e33ee797081cff98edd9f93bce64596e67298ac7e35f6d2593e272a8c' 
  AND token = 'g9wrJDteIRuQw19msYkWqVotKfiwk8sM59OKdtjFHaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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