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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c63a38cbc62432c324d37fa89c8ab181db1760ac2456095f2d7a2b8793bd347' 
  AND token = 'w8mGhzyBTH0IHbbPRaxwr64isr4aM8L5Om54YoXG7OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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