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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac976a2138e1b3b368c815dc7a481554da0c9963438924bdf0019cb59c8da9b' 
  AND token = 'Mr/Pp43TSlb2jzd9U38zoHtCu+Dr7HKGdYv9R3ucVs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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