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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab25792e6c95dc8ad07a2fecd104c3424ed100dbc895d72feba1ecd2d2925a54' 
  AND token = 'bkHuM4zTglN6peCkF7+19yVGSu1b46SwVVdXPQHoHQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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