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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e94ba5301b47d79f1af62871488ec305f695a91a5c4f7ecffb6b417a1253d9' 
  AND token = 'v/DJIMfwopRyv6CtSzPeEgpsvRCvZdEyzEXvP5IfSN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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