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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635e3a68a1287b336c33a9d2bdd35d6984c4255a4dafb192e4daf82409ab3e76' 
  AND token = 'GGEiuroVFvkuXw6eAvO2YoXyoTdlxnXdSJLGxuc8d2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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