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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7a3e4267c794c978469c26ecc20eb89b6b65c1697591078a7f9e06bfaccacf' 
  AND token = 'yK3DwDnm0Gp4qN0UW1vcYBxubqbl7Ua3nPXWimAjwjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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