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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c09937d49bc29c677b381761409ceb883f320f02e8c7da415f9a178b49854e' 
  AND token = 'oI05BDguwR98slotT+vtcoBsdvXJlO1y4KhpICCvOdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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