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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1adccca25cdc9ae732a1c0239903bacd6b31b119a77c299719d20c91a1e2c001' 
  AND token = 'wUkxxPNoarelUz7pC1iQXSeGCU3faPzHW1vU3NlM3d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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