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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde642e467cc78fb0bdc994935b7fc52bec8a3dba40d08336dee274f6764b235' 
  AND token = '8vw/Zz74ZNxc6QdOiH0nSrarFX+RMu3iYE20HVHtIWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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