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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e012f247aafa16d5511eb37e904b8d650299058fb80a02bbb87019bbc4c840' 
  AND token = 'HQ9UnP8THBuEZeQhE/i4Fuqn0iAM9YSHmK6at9VtAsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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