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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '858d2172426fc992896ee707e7f14c275ccfa9093f80cddd2b7ea982e15ac24e' 
  AND token = 'yKj6bjjEFxgmC7Qc9CCWx4Gtp8TUYecz1WTmsc4lwvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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