SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb207ebaeb86fed41ac42d985e2e7d3243f6495201b4f46cd7f0791fa675e9b' 
  AND token = 'ol+IJbfD5mNGSXE5whMJn1nQq2r5Y8q6JeIeEp8MlXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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