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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db394f3e9c2854de269e6601a1911f08f468acf059656300410fdd87b3acaf8' 
  AND token = 'GC3uuxvnxNbM/0ZvMz65VG+I97CsOgc4LLC7EtN8+qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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