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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6de878aa294d017e88c7d97be70a877c1a30d6e536c449286372ff06ba3daf' 
  AND token = 'kpBC3tiNJd/4Or2eULo53RWsJpBztobjTV1nluUqQo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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