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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c994eb3880cde5cf854636f87f402dc107d9a083574c9807684404f8e4e23d1b' 
  AND token = 'g6MjwDGX8RW0vGqKaQngiOAIpN0oiRf5SKDVjZTpNsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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