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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8206da4fa941e9e1abe2aeabe064e9b20666da54069ed634deec3fbd19d8a0c' 
  AND token = '8kfZ2t1P19y4wkTKjfh2fWvjdsY25A0wcD7T8CG+WXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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