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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a35866ef1f333f4c8c90c4ad4290665a9c99512dc4de209de47aa5bcd17b9a' 
  AND token = 'GKoQG5Z1QvSCTJokuiBY2EolZGZYFG6eZFnbgTrW1U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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