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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd3509b599b7abc867f33be8ffe7de23e67af5a05d58e261d2da8fb228db4d8' 
  AND token = 'lxbQcOknwOXwiNDr6POYE2knZnMPuImflkC6oEPGBFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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