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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4053c6b2f1036cd29b591c5ae468a6c933271d0ac91bdfffd3bdf4a133828a03' 
  AND token = 'gw/HGDm0S83jCzbhDH8HBTOzTD4HiVV2Bhfc4rMxTYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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