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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba541575eaf6af9a63e86e187062e900f330f08661a610a8a32b14830505ff8' 
  AND token = 'P68O5guHUPoqZkcT5g1qMgCY9GwRAMFm3tbntr2pAXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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