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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b07b6f315ad12f45fbd41876fe73cd1ccc911ff121e7cb540dbddd70061faa' 
  AND token = '+UxkMNB3mTI6h6o0JvualJmjT8jmNuVN5btgRT9tGCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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