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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435c061d6871f557989e52a6ec66d31b0dd281025c41478a7c872110583ac2f7' 
  AND token = '2p0Dr4kZ0MzjPHN5dQiJ8X8tcjTRiW7iPtIOQHpYRzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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