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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5062398c4c7302173d379d5010865c2e6e694ed4f09b95a685bd0e837600ed05' 
  AND token = '6xLx6TH/t33s3dhDr6g25MnxpLnsqstOoOSsFpg6D+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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