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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de41dd0ca0482b6cbbf84a3e8c4fb2b22703cf42ba26b67e525142c4d5ee1d9' 
  AND token = 'kU5aLb5pUW2jheVbYnrMRoof1EKPgOXc8DUudMihOPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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