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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41447b42ac45fb619d12cef2e856e7341a9d029e82a5a2c3cff3611a342e90dc' 
  AND token = 'raUvxIuHeawSwvjjKuk5qD+S9YnsSe3gH9lalyOvMRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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