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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b47c1f445d9ebac672b9a18fb983436b923237804f2c91c58b4427c59b1be3' 
  AND token = 'oaYVJ5aq7pg7i3782tQKujqqYgNhCA1m7sMNlI7+CMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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