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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c988ea41cddb22c4428abfd18e808eb95515f1533b4bb19a77efc6e6d3d6553' 
  AND token = '7w9haqQZPEDwbyFMeHGDiBJzqyA1RoJExCSZLGMy2y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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