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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c37ce755f327ddb54f3854962b9eb2ca279e20bdb066ef696989442f506ea2d' 
  AND token = 'JWSl/WcyfXqCsuCeowV5HI0bFJL5Tjje8YOy47y5fgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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