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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620eb7691488be38de75ad70ed2b1c2e49e3a9bc254c0d9659f2757e39ac6418' 
  AND token = 'Fh2CGBHXA0XquhBko/ykLDIMxNOPcYfe50ZHbFMo6Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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