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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d866eaf6a173d462c572bc1e7afb017cb760d9476606dcd65d7f8e095c6971b' 
  AND token = 'Uuwi/qpBu+6UENGsW154U0l7lJd+MVTPyqFjT/awSRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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