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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd7d53774cf5eee25016c944e0db6717ce0103996e651a9e3b8eecd1a8a6ad6' 
  AND token = '/+31vGmQhqGZ8aFkjFbjaJuzEaRcgni9P+ka9QgDJQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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