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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e73075de000e76451b894b987c4218a6277621a8b3ee88041c2922368271100' 
  AND token = 'm52izeBkK5ty1JZx8UbsUu1ieCbBlLFqW4Iudfqrx88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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