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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0524999d55d1c9d300ee63bc580dec2e228f0133de417f72bfacbd3b9d1d7ff8' 
  AND token = 'hChUsvIvRssTs35rXz8gdN7xf66CxbLzNa7/q2WkD2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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