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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de7dfd91e8a5ef1d628bef1fc4439fee48d5155637d4e79db96f006087a504b6' 
  AND token = 'mmw3ijAl68u4NlQyYwMSBu6/HPumblTibfMNYeNjNAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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