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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7627e626d6139854a6317c1d4a0315e4035e199faf2ec6d31139d96c3592ce1e' 
  AND token = 'AcyQ6vdeqdLwCWWGC8YR+WNTqtNtvOR9DabrAxDJsWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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