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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4af6f00ed30451c63312f9fe08bb9e1eb4ea5e24a53e1a4ee09ec32ac587df' 
  AND token = 'FLbl+VFy7n4sLKSZ695/lzWce6D3mwTO/X6Asc15Cns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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