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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8882f33a03fdbee92d0c79f82162dedb6e37c10732b3b282307ee3e27746cf5e' 
  AND token = 'vVX5sdN7yXUyr0ff2dGa6UjZgQmKluK0nL+tpbfkUBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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