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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08736b1ded09c88849e2a780ccd5f19c78dd816a6174a12f11b1839b1e8008b4' 
  AND token = '28qCfWQTqvnhtPa3tZ0exv2rej9ZaT7LgjDqFXLRWgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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