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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d708a9b32fb7a23bf0513b9986da5ba87aa535b3f21e5b405a37b49e851dca' 
  AND token = 'ou+Sapi6shEuwUWRQzhqsOIcoq6pn7cIxXWS3Aez8jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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