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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b911e57a95173e4f47150fd90735617f5a8d222169a46e5e3cfe954532b97e55' 
  AND token = 'lMSscg5B1OgYRn7R8oHvoPLoS0VpTYTm8UVXyN8dCfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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