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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d44eeb7773076609a76d4c72749e74a8ce566e1eea959014b8f8b0df96e3c19' 
  AND token = 'WKnAD6727pwl8i3YUs/7Vg4MXrr/p7wTFzAOMBjpqLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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