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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7c0a89a3962842762f114f346d4eff8b1a12c7f88a58d06fc997554ec76367' 
  AND token = 'LviFFuhAuFLPT4563XSTEYWcStlls33k90mCoFRyWK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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