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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04335f430ba1845b28a6c38fb9daa5fc9a64f1c8b044921ff771e5c258b87a02' 
  AND token = '4f/Hcr6P9tgXUveYCo5dp9ZUfd7uL+imfI28gTXqzvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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