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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c36f557f75154c83be07bde5e8e3f16da793fa24cf381290348ceaba4743c4' 
  AND token = '10ZX53qdUdRnVT5FgaIjP1XMWaMw8641Ag0Cz3dXjRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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