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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a3edc08f9fdb680e7d7d64b7be8038a398590a9678160765a804810e78ff88' 
  AND token = '9tr6IwWVl7mihnSfKDXGvxk4AYa1xvoOfyeDKcCSYp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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