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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d7d2a53f3496a806369456bc385ccea6a903887c52caf525232f43d2e617aa' 
  AND token = '5QYbTqg5JCcW6txHcXPJTdfIggC95b42HeOVn8tNqj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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