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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb91ab9b775e460771a8910d51cf2ff13fec0fb6a213605acbe1850749d22302' 
  AND token = 'qniszAOTSraHx4ezZbaxy9TOl9hbI9LV/dv9RdHLW18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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