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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f1a9114678e0684f3a7a7eda56b0bf38ae16ff537d146e21a39542753a1a629' 
  AND token = '3q5tsqnVwK0SCcGeD4jVI23HWmfBNa62TWbwv7j1YDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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