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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943aa77f0e89755fe9a379a90e5321981a6147d5b9a3cd01e7511532f1cbfc46' 
  AND token = 'J5RO1juEzyUItSjF63gYXNj5WEFFH32PVZg1dj2TRU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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