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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95ad3ae71a50b77dca0bec35bff9a09fc001333b9fdb00249bbfb25dca55add' 
  AND token = '9OhLEcYoA7uKVOIWplmrLU4QTZIUN89qOl3x2NnY61o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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