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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db78be1682f2ceea8350e5735eb6416da007ffe150052a5f3d1b7eeb3badd82' 
  AND token = 'CW38dl5dEdY0+9XB+MorG4e2ZP1NcEikeQCW8tNvP64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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