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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b92ff989ff30ba6a06338010a04cac9b73a9b1813ae91c1ea6f0f694f76c9c0' 
  AND token = 'LF9DdbGSM1tJHaJlZRYjUvqGy1vweJYRAOKDbKEgNhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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