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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634814eb609c01a59398ed35f730f1a07a4aa20763405834f5dfe525fabb7790' 
  AND token = 'HYQcEv/C8VaLdbBqc0NPO8/abpJbqqQvBy4pig0q44c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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