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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c90c6de39cff4d57e1b32d4b4e145ea714f9a68c84fbda9246fd03bb74f6af' 
  AND token = 'Qp8TST/qzulyT2ZSDryQgBXdFWUSN+daJUpWDHb0yXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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